Further, studies suggest that deaf subjects may have enhanced peripheral and inferior field vision, and that signers, regardless of hearing status, have a left visual field advantage for motion sensitivity.
Enhanced peripheral attention with reduced central attention is a common finding in deaf signers, as is improved performance on mental rotation tasks.
When there is an option to choose between tasks using symbols or letters, symbols are preferred, as Clark found that on a perceptual task, deaf adults performed more poorly than hearing peers when letters were used as the stimuli, while the two groups performed equally when symbols were used.